\begin{tabular}{|l|l|}
\hline Q.22 & $\begin{array}{l}\text { A heat engine extracts heat }\left(Q_{\mathrm{H}}\right) \text { from a thermal reservoir at a temperature of } \\ 1000 \mathrm{~K} \text { and rejects heat }\left(Q_{\mathrm{L}}\right) \text { to a thermal reservoir at a temperature of } 100 \mathrm{~K}, \\ \text { while producing work }(W) . \text { Which one of the combinations of }\left[Q_{\mathrm{H},} Q_{\mathrm{L}} \text { and } W\right] \\ \text { given is allowed? }\end{array}$ \\
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1. & $Q_{\mathrm{H}}=2000 \mathrm{~J}, Q_{\mathrm{L}}=500 \mathrm{~J}, W=1000 \mathrm{~J}$ \\
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2. & $Q_{\mathrm{H}}=2000 \mathrm{~J}, Q_{\mathrm{L}}=750 \mathrm{~J}, W=1250 \mathrm{~J}$ \\
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3. & $Q_{\mathrm{H}}=6000 \mathrm{~J}, Q_{\mathrm{L}}=500 \mathrm{~J}, W=5500 \mathrm{~J}$ \\
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4. & $Q_{\mathrm{H}}=6000 \mathrm{~J}, Q_{\mathrm{L}}=600 \mathrm{~J}, W=5500 \mathrm{~J}$ \\
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\end{tabular}

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